Political correctness feels like a no-brainer to its advocates, and it would be really great if it was. But sadly this confidence, and the tendency towards absolutism to which it tends inevitably cause more problems than solutions. As Stephen Fry points out:
I'm standing next to someone with whom I have...differences in terms of politics and all sorts of other things, precisely because I think all this has got to stop. This rage, resentment, hostility, intolerance. Above all, this "with us or against us" certainty.
Regardless of which side of the debate you stand, you'll almost certainly be able to point to the rage, resentment, hostility and intolerance of "the other side" as evidence of their misguidedness. But even if you're right, this isn't an end point. The day has to come where we choose to stand beside those with whom we disagree and talk to them. The language we use is secondary to the fact that we speak.